Mechanism for starting and stopping weaving looms



March 27, 1951 E. J. PFARRWALLER 2,546,333

MECHANISM FOR STARTING AND STOPPING WEAVING LOOMS Filed Dec. 4, 1946 KAWA TT'ORNE).

Patented Mar. 27, 1951 V UNITED ST E J t'erthii'r, SwitzerlandApplication December-4, 1946,;S e1ial No.9714fl22 'In Switzerland-June:18, 4.943

'Sectionl, Public Law 690, August 8, 194B Batent' expires Jun'e 18, 1963 'I'he present invention relates :to a :method and means :forstopping and stanting slooms fo'r weaving of the itypel'having "a single:motor and a imain drive shaft connected with said motor by means of "azclutch and being equipped with a :brake for :quickly istopping zsaidshaft and the loom when said clutch disconnected.

at 181811 obj ect of :the :present invention to :provifie a method 'iorstopping a tiast operating loom of .the type set forth, :by:substantially simultaneously Jdisen'gaging :the clutch and :en*- gaging:the "brake in response to :;a failure @such as breakage"ofia thread.

it is an obi ect -of the, present (invention to provide ;a :method forstopping a fast operatin'g loom of ithe type :set :forth, bysimultaneously disengaging the clutch and engaging the :"brake :andlocking :it in braking position, in response to 'a failure such asbreakageof :a thread.

A further object of the invention is ia method of stopping 'a :-a'stoperating loom -by simultaneousl-y stopping :the doom drive,disconnecting the drive from tl'ie rest of the 1100111 and absorb-j ingand i destroying the kinetic energy of a1 l movin of the loom, :andinitiating the three aforestated steps in dependence on an operatingcondition of the loom. 1

An object of the invention is the provision of a method for starting :aloom of the type :set forth in which "the brake is disengaged prior toengagement "of :the clutch by means :of two consecutive manipulations.

further-object of the invention is the provision of a mechanism inlooms-of the type set forth, said mechanism comprising means responsiveto an operating condition of the loom, for example weft tension, whichmeans actuate the clutch and the :brake simultaneously and whichmechanism comprises means afiording consecutive release of-ithebrake andengagement of the clutch.

A further object of the invention Tis the provision of a mechanism -inlooms of the type 'set forth, said mechanism comprising means ITE-spon'sive to an-operating condition of the loom, for example -wefttension, which means actuate the clutch and the-brake simultaneously andlock the latter in braking oondition.

'An'other object of the present int/"relation Eis the provision or amechanism in lo'oms io'r weaving -9 Claims. 1(Cl. 139-336) of the 'typesetiforth, which-'mechanism comprises means irespons'ive to :an:operating condition or the iloom-which actuate the :clutch and thebrake and "hand operable means which when manipui iated inqinedirectionirelease thebrake and when manipulatedin the nether directionengage :the clutch.

ti's xea'n :object of th'e invention 'to provide, in. a loom 0f the typeset forth, :a mechanism comprising :a handle connected with :a two :arm

lever one end of which :is adapted to engage. an abutment and the "other:end 1 of which is con-- nected with the free end of a ':-to'ggleleverijoint whereby said abutment is engaged and saidd oint is:stretcheduipohipulling'on :said handle. I-here-,

upon the brake is disengaged. 'By returning said handle'zint'o its:initialspositionsaidabiitment is disenga-ged and said joint v remainsin stretched position and said lever causes engagement idf. the clutch.Said handle is held in"one-'of :its,

two operating :positions, 461 example b-y an Labrttf merit, :and :ifthen said toggle Joint zis collapsed, for example by a ipow'er applied:in response an --'undesired operating condition of :the -loom, atensioned spring neleased :and engages th'e brake :and *dise'ngages theclu-tch.

A further object of the invention is the -provision of :a switchcontrolling ipower supply to the motor operating the loom which switchis connected with the mechanism set :forth @above and is :opened whensaid-mechanism is operated for applying the brake and disconnecting theclutch. The hand operable means :for starting the loom a'are soconstructed that the clutch operating me'chai-iisih cannot :act :hack onsaid handle .means durmg mormal operation and oor-- rect position ofsaid means --is assured at times when the toggle joint is collapsed forstopping of a portion of the mechanism shown iEig.

Like parts are designated by like numerals in both figures of thedrawing.

Numeral I designates an electric motor which drives the pulley 2 mountedon shaft 3. The latter can be connected with the main shaft 4 of theloom by means of the clutch 5, 6. Clutch disk 6 is rigidly connectedwith shaft 4 and disk 5 can be axially displaced on shaft 3, but is notrotatable thereon. Shaft 3 is hollow and retatable on shaft 4.

A brake disk 1 is rigidly connected with shaft 4 and may be made of onepiece with disk 6. In the drawing two separate disks 6 and I are shownto make the illustration more clear. A brake shoe 8 is mounted on alever 9 and adaptedto be pressed on disk I by means of a sprin I 0. I

The free end of lever 9 is connected with one end of a two-arm lever IIby means of a pin I2. The two-arm lever H has a fulcrum I3 to which oneend of a rod I6 is connected swingably. The other end of rod I6 isconnected to pin I! at the end of the short arm of a bell crank leverwhich swings about a stationary fulcrum I8 and has a long arm I9 whichis provided witl a handle for manual operation.

The free end of lever II is provided with a nose portion I4 whichcooperates with a stationary abutment I5. Inside of nose I4 a set screwis provided on lever II which screw is adapted to engage one end of anaxially reciprocatingly movable rod 2!. The other end of rod 2I rests onarm 22 attached to shaft 23. The latter carries a forked arm 24 whichengages the axially movable clutch disk 5. A spring 33 which issupported by a stationary part 34 and connected to arm 24 tends todisengage the clutch 5, 6 and maintains engagement of arm 22 and rod 2I.

Fulcrum I2 which swingably interconnects one end of lever 9 and one endof lever II holds also one end of a link member 25, the other end ofwhich is fulcrumed at 26 to one end of a lever 21. The other end oflever 21 swings about a stationary pivot 28. The system to 28constitutes a toggle joint. If the'system 25, 2! forms one straightline, the brake shoe 8 i removed from the disk I and locked in thisposition.

f The fulcrum 26 of the'toggle joint system may be displaced by one endof a rod 3I. The other end of rod 3I abuts arm 30 connected with a shaft29 which may be rotated, for example, by actuation of a solenoid 40which is energized if, for example, a thread feeler M which is normallyheld-in the position shown in Fig. 1 by the tension of a thread 42,revolves clockwise when said thread breaks. In this case a switch 43 isclosed.

If rod 3| moves to the left the toggle joint system collapses and brakelever 9 swings clockwise under the influence of spring III, whereby thebrake shoe 8 is pressed to the disk 1.

Lever 21 actuates a switch 32 which controls the current supply to motorI. This switch is closed only when the lever system 252'! is stretched.

The following describes the operation of the mechanism with the aid ofthe diagram, Fig. 2. It is assumed that the lever system 252I has beenbent by means of the rod 3!. Fulcrum I2 is thereby moved under theinfluence of the spring II] from position I2 to position I2 and thebrake has been applied. Fulcrum I3 remained in its original position I3because hand lever I9 remained in the position shown in full'lines. The

set screw 20 has moved from position 20" to po' sition 20 and the clutchdisk 5 has been permitted. to remove itselffrom. disk 6 under the.

influence of spring 33. If hand lever I9 is moved counterclockwisetoward the position shown by dash-dot lines, rod I6 is pulled up andpulls twoarmed lever II with it, whereby the nose I4 engages abutment I5and becomes a fulcrum. Lever II is now in the thin dotted line positionwith fulcrum I2 remaining in position I2. Upon further lifting of rod I6fulcrum I3 reaches position I3 and fulcrum I2 position I2, whereby thelever system 252'I is stretched. Lever I I is now in the position shownby a dash-dot line. In this condition of the mechanism the brake isdisengaged and the loom shaft 4 is still disconnected from th motor I.Shaft 4 extends through the hollow shaft 3 and is provided with a handwheel 35. By manipulating the latter the moving parts of the loom can bebrought into any desired position. Stretching of system 252'I causesclosing of switch I 32- whereby the motor I is started.

If it is now desired to drive the loom by means of the motor I handlever I9 is returned from the dash-dot line position to the solid lineposition and lever II, revolving about fulcrum I2 which is in positionI2", is pressed down into the position indicated by a heavy dotted line.This brings the set screw 20 into position.20.': and depresses rod 2I'whereby clutch 5, 6 is en-. gaged. The brake remains in disengaged posi'tion because of the locking effect of the lever sys-f tern 25-21. Themechanism cannot act'back; on hand lever I9 because its short arm I! is.slightly beyond its lower dead center position and abuts the stationaryabutment 44. In case of any irregularity in the operation of the loomthe ful-I crum 26 of the toggle joint system 25 to 21 is displaced bythe rod (H and lever II, under the influence of spring I0, moved fromthe heavy dotted line position in Fig. 2 into the position indicated bya solid line. This causes disengagement of the clutch and application ofthe brake. Suitable adjustment of the set screw 29 assures that clutch5, 5 is disengaged first and brake I, 8 applied subsequently which isthe desired form.

' of operation.

While I believe the above described embodiment of my invention to be apreferred embodiment," I wish it to be understood that I do not desireto be limited to the exact details of design and con-- struction shownand described, for obvious modic'ations will occur to a person skilledin the art.

I claim:

1. A mechanism for controlling the operation of looms for weaving havinga motor, a drive shaft, a clutch interposed between said shaft and. saidmotor, and brake means for braking said shaft, said mechanism comprisinga single handle movable in two different directions, actuating meansinterconnecting said handle and said brake means, and clutch operatingmeans engageable by. said actuating means and connected with said;clutch, said actuating means being adapted to release said brake meansupon movement of said handle in one direction and to engage saidclutchoperating means upon movement of they same handle in the otherdirection.

2. A mechanism for controlling the operation of looms for weaving havinga motor, a driveshaft, a-clutch for connecting and disconnecting; saidshaft to and from said motor, a brake for, braking said shaft, saidmechanism comprising; a'handle movable in two substantiallyoppositedirections, motion transmitting means interconnectingsaid'handle and said brake, and releasns saidbrake uponm e eni pi a ianlfi 1 amazes one direction, and other motion transmitting" meansengageable by said first transmittin means and engaging said clutch uponmovement of the same handle in the opposite direction.

A mechanism for controlling the operation of looms for'weaving having a.motor, a drive shift, a clutch disconnectably connecting said shaft andsaid motor, and brake means for braking said shaft, said mechanismcomprising a single handle movable in two different directions, a trainof motion'transmitting members connected with said handle and with saidbrake means for operation of the latter in dependence on the position ofsaid handle, and other motion transmitting means engageable by saidfirst transmitting means and connected with said clutch.

4. A mechanism for controlling the operation of looms for weaving havingmotor means, a drive shaft, a clutch disconnectably connecting saidshaft and said motor means, and a brake for braking said shaft, saidmechanism comprising a handle movable toward two extreme and oppositeoperating positions, a set of motion transmitting means connected withsaid brake and with said handle and comprising locking means adapted tolock said brake in disengaged position, another set of motiontransmitting means engageable by said first transmitting means andconnected with said clutch and holding it in engaged position when saidlocking means are in looking condition and said handle is in one extremeposition, said first transmitting means affording engagement of saidbrake and actuation of said other transmitting means for disengagementof said clutch when said locking means are unlocked and said handle isin the same extreme position.

5. A mechanism for controlling the operation of looms for weaving havinga motor, a drive shaft, a clutch disconnectably connecting said shaftand said motor, and a brake for braking said shaft, said mechanismcomprising a handle movable toward two extreme substantially oppositeoperating positions, a train of motion transmitting means connected withsaid brake and with said handle and comprising locking means adapted tolock said brake in disengaged position, other motion transmitting meansengageable by said first transmitting means and holding said clutch inengaged position when said locking means are in looking condition andsaid handle is in one extreme position, said first transmitting meansaffording engagement of said brake and actuation of said othertransmitting means for disengagement of said clutch when said lockingmeans are unlocked and said handle is in the same extreme position, andaffording disengagement of said clutch and releasing of said brake andlocking of said locking means and retaining of said other transmittingmeans in clutch disengaging position when said same handle is moved tothe other extreme position.

6. A mechanism for controlling the operation of looms for weaving havinga motor, a drive shaft, a clutch disconnectably connecting said shaftand said motor and a brake for braking said shaft, said mechanismcomprisin a handle movable to two extreme operating positions, a trainof motion transmitting means connected with said brake and with saidhandle and comprisin looking means adapted to lock said brake indisengaged position, other motion transmitting means engageable by saidfirst transmitting means and holding said clutch in engaged positionwhen said locking means are locked and said handle is in one extremeposition, said first transmitting 6'" means affording" engagement ofsaid brake and actuation of said. other transmitting means fordisengagement of said clutch when said locking means are unlocked andsaid handle remains in the same extreme position, and affordingdisengagement of said brake and locking of said locking means andretaining at said other transmitting means in clutch disengagingposition when said handle is moved to the other extreme position, andaffording actuation of said other transmitting means for engagement ofsaid clutch when said handle is moved back to its first extremeposition.

7. A mechanism for controlling the operation of looms for weaving havingmotor means, a drive shaft, a clutch disconnectably connecting saidshaft and said motor means having resilient means for moving the clutchto the disengaged position and brake means for braking said shaft havinga movable member and resilient means for movin the movable brake memberto braking position, said mechanism comprising a toggle joint connectedto said movable brake member and adapted to be cooked for holding thebrake means out of the braking position, a tripping device adapted torelease said toggle joint for shutting down the loom, a lever pivoted atone end to the movable brake member, a fixed abutment at one side of thesaid lever, the lever being so oriented with respect to said movablemember that lateral movement of said lever toward the said side thereofdisengages said brak means, a movable member at the other side of theother end of said lever adapted to be engaged by said lever andconnected to said clutch means for engagin the latter upon movement ofsaid movable member away from said fixed abutment, and an operating rodpivoted to said lever at a point intermediate the ends thereof, wherebymovement of said rod in the direction of said abutment serves to cookthe toggle joint and release the brake means, and return movement ofsaid rod serves to engage the clutch leaving the toggle cocked and thebrake means released to cause operation of the loom.

8. A mechanism for controlling the operation of a loom for weavinghaving an electric motor, a drive shaft, a clutch interposed betweensaid shaft and said motor, and a brake for braking said shaft, saidmechanism comprising actuating means for engaging and disengaging saidbrake, means engageable by said actuating means for operating saidclutch, and switch means so connected with said actuating means as tointerrupt the current supply to the motor when said brake is engaged andto close the current supply when said brak is disengaged, independentlyof the position of said clutch.

9. A mechanism for controlling the operation of a loom for weavinghaving an electric motor, a drive shaft, a clutch interposed betweensaid shaft and said motor, and a brake for braking said shaft, saidmechanism comprising actuating means for engaging and disengaging saidbrake, locking means adapted to lock said brake in disengaged position,means engageable by said ac- (References on following page) 7"REFERENCES CITED' Number The" following references are of record in thefil e of thls patent. 2 2

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